CRP and coinfection: However, in this age group, bacterial mono-infections (mean CRP 66.6 ± 80.6 mg/L) and one reported viral co-infection (CRP 52.3 mg/L), as well as mixed bacterial-viral co-infections (mean CRP 58.4 ± 70.2 mg/L), demonstrated approximately five- to six-fold CRP increase.